Important Rulers of Qatar By lmontesin@stu.acs-schools.com Jan 1, 2015 Sheikh Ali bin Abdullah Al-Thani 1850 to 1878 Dec 3, 2015 Seikh Mohamed bin Al-Thani Dec 3, 2015 Seikh Jassim bin Mohammad bin Thani Dec 3, 2015 Shiekh Abdullah bin Jassim Al-Than